A millionaire Long Island husband and wife — living in a $2.2 million mansion — were nabbed for pretending to be paupers, ripping off Medicaid to the tune of $33,000, authorities said.

Dalia Mairzadeh, 45, of tony Old Westbury, was sporting a fur-trimmed suede coat when she and hubby Daniel, 45, were picked up yesterday and slapped with charges of grand larceny and welfare fraud.

Their 18-year-old son, Andrew — who was informed of his parents’ arrest by The Post — said his mom has at least one expensive fur coat.

“I had no idea” about the arrests, he said.

While claiming to Nassau County social services to be dirt poor, the couple lived in style at the sprawling, 2-acre modern estate, which features a swimming pool, a pond and a fountain. A Mercedes was out front yesterday.

The Mairzadehs allegedly faked documents claiming they rented their spread, and face up to seven years behind bars, said Nassau DA Kathleen Rice.

Over the five years that they allegedly bilked the system beginning in 2004, Daniel claimed he was earning a paltry $633 a week or less as an employee of the firm he owned, Fundstone Developers Inc., officials said.

Sources said he specializes in building large mansions, and his son said he owns a liquor store.

His wife’s income as a powerful real-estate agent selling multimillion-dollar estates was not reported at all, authorities said.